How are you doing that? Give some more info to work with.
What type of HA installation are you running? Hass.io on a raspi?
What is the version of: (HassOS,) supervisor, Homa Assistant…
Do you use the Node-RED Community add-on?
I assume in combination with the Dropbox Sync add-on?
Are both add-ons up-to-date? Latest Node-RED add-on is v1.0.1 and for Dropbox Sync v1.3.0.